The former political heavyweight — who wore his holiday favourite, a navy polo shirt — is in Miami to give a speech to the Credit Suisse Global Trading Forum. He decided to combine it with a family break.

A witness said: “The Camerons seemed to be having a great time. They were getting star treatment, though no one on the beach seemed to recognise him.

“They swanned through the pool area with their own security detail and had their own private cabana.

REALITY STAR 'RAPED'

Granny from Hell

“Judging by Cameron’s physique, he seems to have had more time to exercise since leaving office. And Sam looked great. She has a fantastic bikini body.” The couple cooled down with dips and relaxed by reading books.

Mr Cameron — said in a biography to be able to win an Olympic gold for “chillaxing” — resigned as PM in June after campaigning in vain for a Remain vote in the EU Referendum.